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1 March 2004 Effect of pH on Inhibition and Enhancement of Luminol–H2O2–Co2 Chemiluminescence by Phenolic Compounds and Amino Acids
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Abstract

The effect of pH on inhibition and enhancement of luminol–H2O2–CO2 chemiluminescence (CL) by 18 phenolic compounds and 20 amino acids was studied. It was found that most of the tested compounds showed an inhibiting effect at lower pH and an enhancing effect at higher pH. At a midrange pH, for some phenolic compounds with two ortho-position –OH, both an inhibiting and an enhancing peak were simultaneously observed. UV–visible spectra of the tested phenolic compounds at different pH values were studied. The mechanism for CL inhibition and enhancement was proposed. It is likely that the competition of the –OH or the –NH2 group and other reducing groups in the molecules with luminol for O2·− led to the CL inhibition. A reaction of –COO and quinone or ketone formed by phenolic compounds at higher pH via deprotonation with O2·− also resulted in the CL enhancement.

Hua Cui, Ming-Juan Shi, Rong Meng, Jian Zhou, Chun-Ze Lai, and Xiang-Qin Lin "Effect of pH on Inhibition and Enhancement of Luminol–H2O2–Co2 Chemiluminescence by Phenolic Compounds and Amino Acids," Photochemistry and Photobiology 79(3), 233-241, (1 March 2004). https://doi.org/10.1562/BE-03-28.1
Received: 3 October 2003; Accepted: 1 December 2003; Published: 1 March 2004
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